Grinder and attachment therefor



r; April 18, 1961 E. J. BEAVER 2,979,867

GRINDER AND ATTACHMENT THEREFOR Filed July 24, 1957 2 Sheets-Sheet 1 INVENTOR.

I J. B EAVE R ATTORNEY April 1961 E. J. BEAVER 2,979,867

GRINDER AND ATTACHMENT THEREFOR Filed July 24, 195'? 2 Sheets-Sheet 2 4 f I I 1 /46 i I i 1 M AIM INVENTOR.

EDWARD J BEAVER WW ATTORNEY United States Patent 2,979,867 GRINDER AND A'ITACI-MNT THEREFOR Edward 1. Beaver, 229 New Meadow Road, Barrington, RJ.

Filed July 24, 1957, Ser. No. 673,876

1 Claim. (Cl. 51-125) The present invention relates to improvements in grinders and attachments therefor and more particularly relates to an improved combination of tool supporting means and a horizontally disposed grinding wheel slotted for transparency during operation.

An object of the present invention is to provide an improved grinder and attachment therefor which will enable an operator to preselectively hold a tool to be shaped or sharpened with respect to the under or peripheral surface of a horizontally disposed grinding wheel so that upon operation the shaping and sharpening of the tool can be visually observed and the desired result obtained.

'Another object of the present invention is to provide an improved grinder and attachment therefor, wherein circular tools can be sharpened or shaped while being held in preselected relationship to predetermined surfaces of a horizontally disposed grinding wheel.

A further object of the present invention is to provide an improved grinder and attachment therefor whereby the compound angular relationship desired in the cutting edges of a tool can be prearranged by adjustment of supporting means therefor.

Still another object of the present invention is to provide an improved grinder and attachment therefor whereby drills and the like can be held in predetermined relationship with respect to the underside of a horizontally disposed grinding wheel and oscillatably supported so as to produce the desired shape in the point of the drill.

Various other objects and advantages will become apparent from the detailed description to follow.

in the drawings:

Figure l is a side elevational view of my improved grinder and attachment therefor;

Figure 2 is a top plan view of the arrangement shown in Figure 1, part being broken away;

Figure 3 is a front elevational view of the arrangement shown in Figure 1;

Figure 4 is an exploded sectional view showing the components utilized for supporting a drill or the like with respect to the grinding wheel;

Figure 5 is a top plan view of one of the elements in the assembly of Figure 4; and V Figure 6 is a horizontal sectional view taken substantially along the plane of line 66 in Figure 3.

Referring more particularly to the drawings, wherein like numerals apply to like parts throughout, it will be seen that the assembly 10 includes a common base 12 on which is supported a vertically disposed motor 14 which drives a horizontally disposed grinding wheel 16. and tool supporting means 18, 20 and 22. The assembly 10 also includes illuminating and magnifying means 24.

llaving reference first to Figures 1 through 3, it will be'seen that the base [2 may be formed from a single met all ic plate. The motor 14 is formed with a flange at -26which is bolted to the base [2 by means of the bolts 28. The grinding wheel la is disposed in a horizontal plane substantially parallel to the base 12 and is clamped "ice to the shaft of the motor 14 between the pair of flanges 30 and 32 by means of the holding nut 34.

Also carried by the base plate 12 is a guard holder 36 to which is attached the guard ring 38 by means of the vertical portions at 40. The guard ring 38 is disposed concentrically of the grinding wheel 16 and slightly above the upper surface of the grinding wheel.

In sharpening and shaping certain tools, it is desirable to form compound angular relationships at the cutting edges thereof. In order to facilitate such formation, the supporting means 18 is provided. A pair of spaced, parallel upstanding plates 42 and 44 are secured to the base plate 12 so as to be substantially perpendicular thereto. Each of the plates 42 and 44 is provided with pivot holes at 46 and 48. The plate 44 is substantially larger than the plate 42 and is formed with an arcuate slot at 50. The plate 44 has a scale thereon at 52 which is used when the plate 54 is pivotally associated with the holes at 48, whereas the scale at 56 is utilized when the plate 54 is pivotally associated with the holes at 46. The plate 54 is shown to be rectangular in shape and having outstanding pivot pins 58 at the lower end portion thereof. The pivot pins 58 are selectively engageable in the apertures or holes 46 or 48, depending upon the degree of inclination desired in the plate 54.

The plate 54 has a bar 60 pivotally associated therewith by means of the pivot 62 adjacent the upper corner thereof. The bar 60 can assume the vertical relationship shown in Figure 3 or can be pivoted to an inclined relationship on the plate 54. In order to adjustably hold the bar 60 in a selected angular relationship on the plate 54, an adjustment screw 64 is provided which is engaged through the slot 66 formed in the plate 54. Moreover, the plate 54 is formed with a scale at 68 so as to preselectively adjust the bar 60 to a given angle.

In view of the foregoing, it will be seen that a tool to be shaped or sharpened can be placed on the plate 54 and abutted against the edge 70 of the bar 60. By adjusting the angular relationship of the bar 60 on the plate 54 and holding that angular relationship by the screw 64, and by adjusting the inclination of the plate 54 with respect to the plate 44 and holding it by means of the adjustment screw 72, shown in Figure 1, the tool can he slid upwardly into engagement with the underside 74 of the grinding wheel 16 and the desired compound angular relationship will be produced. Inasmuch as the grinding wheel 16 is formed with slots at 17 and 19, high speed rotation of the grinding wheel enables the operator to see through the wheel and actually observe shaping or sharpening of the tool by the underside 74 of the grinding wheel 16.

The supporting means 20 will now be described. A post 76 is secured to the base plate 12 in perpendicular relation thereto, and an upper intermediate portion thereof is formed with external threading as at 78. An adjustment bushing 80 is engaged on the threading 78. A connector block 82 is slidably carried by the upper portion of the post 76 and rests on the adjustment portion 80 so as to be vertically movable thereby. The connector block 82 may be locked in a vertical selected position by means of the adjustment screw 84. Moreover, the connector block 82 can be angularly adjusted with respect to the post 76 when desired. The connector block 82 is formed with a laterally disposed opening at 86 into which is threadably secured a rod 88. By angular and vertical adjustment of the connector block 82, the rod 88 is in preselected relationship with respect to the grinding wheel 16. A conventional circular tool can be slidably engaged on the rod 88, and by longitudinal sliding on the rod 88, the tool can be sharpened by the grinding wheel 16.

An alternate tool carrier rod is provided at 90. The rod 90 is slidably engaged through an opening 92 in the angle block 94 pivotally associated With the connector block 82. The angle block 94 is formed with a beveled surface at 96 which is graduated so that the angular relationship between the angle block 94 and the connector block 82 can be adjusted and held by the lock screw 98. The tool carrier rod 90 has one end thereof formed with external threading 100 so as to be threadably engaged within the central aperture of a conventional circular tool. Thus, the circular tool can be held in preselected compound angular relationship with respect to the grinding wheel 16 and by longitudinal sliding of the tool carrier rod 90 in the angle block 94, sharpening or shaping of the circular tool can be accomplished.

The supporting means 22 includes a connector sleeve 102 which is vertically adjustable on the post 76 by the use of the feed screw 104 and the knurled nut 106 vertically engaged thereon. Feed screw 104 is vertically disposed and rigidly secured to the base plate 12 and the nut 106 is engaged against the undersurface of the connector sleeve 102. The connector sleeve 102 also can be angularly adjusted by rotation about the post 76, and the adjustment screw 108 can be utilized for fixing the connector sleeve at any desired relationship. The connector sleeve 102 has a laterally disposed attachment rod 110 carried thereby. The attachment rod 110 is rotatable about its own axis so as to be angularly adjustable with respect to the connector sleeve 102.

Looking now at Figures 4 through 6, the particular means employed for holding a drill or the like in a desired relationship to the grinding wheel will now be described. As there shown, a block 112 is provided with a V-shaped groove 114 for receiving a drill D" therein. A U-shaped bridge 116 is carried by the block 112 and a clamping screw 118 is engaged through the bight portion 120 so as to be adjustable for clamping a drill D into the V-shaped groove 114. On the side opposite from the V-shaped groove 114, the block 112 has a pivot pin 122 extending therefrom and terminating in a flanged end 124.

The attachment rod 110 has a member 126 secured thereto by means of the screws 128 adjacent the end thereof. The member 126 is formed with a cylindrical recess 130. A disc 132 of a size adapted to be rotatably received within the recess 130 is provided for interconnecting the block 112 with the member 126 and attachment rod 110. The disc 132 is of annular shape and is provided with a pair of bearing screws 134 which are threadably engaged through the annular disc 132. The screws 134 have sleeve-like portions 136 formed on their inner ends and rotatable relative to the screws proper. The sleeve-like portions 136 are adapted to grip the pivot pin 122 so as to provide a bearing therefor. By adjustment of the screws 134. the pivot pin 122 can be located coaxially of the disc 132 or eccentric with respect to the axis of the disc 132. The flange 124 of the pivot pin 122 retains the block on the disc 132 and the plate 138 retains the disc 132 in the recess 130 by means of the screws 140.

Accordingly, when it is desired to sharpen or shape a drill, it is merely necessary to engage the drill shank in the V-shaped groove 114 and clamp it by means of the screw 118. The attachment 110 can be angularly adjusted with respect to the connector sleeve 102 after securernent of the connector sleeve 102 in preselected re ationship with the post 76. Thereafter the eccentricity of the pivot pin 122 with respect to the disc 132 can be adjusted. Thereupon, the drill can be shaped or sharpened by an oscillatory movement with surface portions of the drill engaging the underside of the grinding wheel 16, as will be obvious.

The magnifying and illumination means 24 is universally mounted on the upper end of the post 76. The

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4 s upper end of the post 76 is formed with a ball 142 while the plastic shield 144 has a plate 146 secured thereto by means of screws 148 with a ball 150 outstanding therefrom. A pair of plates 150 and 152 formed with cup shaped ends receive the respective balls 152 and 150 therein. A screw 154 and wing nut 156 connect the plates 150 and 152 to hold the balls 142 and 150 and universally support the means 24 thereby. The plastic case 144 has a magnifying glass 158 centrally supported therein by means of the shield 160 which is secured to the plastic shield 144 at the flange 162. An annular fluorescent tube 164 is received within the plastic shield 144 and held by the spring clips 165. Of course, the fluorescent tube 164 is connected to a suitable source of electrical power. Similarly, the electric motor 14 can be connected to a source of power. The switch 166 is provided for controlling operation of the fluorescent tube 164. The switch 168 is provided for controlling operation of the motor 14.

It will thus be seen that after mounting the tool to be sharpened, which may be of any conventional form, it is engaged against the cooperative surface of the grinding wheel 16, such as the undersurface 74 thereof. The sharpening and shaping is effected by the grinding wheel while the operator observes the action through the wheel 16 by utilizing the illumination of the fluorescent tube 164.

and by observing the operation through the magnifying glass 158.

In view of the foregoing, it will be seen that I have provided an arrangement which fulfills the objects hereinbefore enumerated.

As this invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, the present embodiment is therefore illus-. trative and not restrictive, since the scope of the invention is defined by the appended claim rather than by the description preceding it, and all changes that fall within the metes and bounds of the claim or that form their functional as well as conjointly cooperative equivalents, are, therefore intended to be embraced by the claim.

I claim:

In a grinding machine having a horizontally disposed grinding wheel connected to a motor for rotation thereby, said grinding wheel being slotted so as to provide visibility through the wheel during rotation thereof, and a supporv ing means for holding a tool in preselected relationship with respect to the grinding wheel, said supporting means comprising a post, a base providing a common support for said motor and grinding wheel and said post, a connector sleeve vertically adjustably carried by said post, an attachment rod laterally carried by said sleeve and rotatably adjustable about its own axis relative to said sleeve, and a tool clamping member carried at the free end portion of said attachment rod, said tool clamping member including a block having a groove at one side for receiving a drill to be sharpened, means carried by said block for holding a drill in the groove, and said block having a pivot pin extending from the side opposite from the groove, said attachment rod having a cylindrical recessed portion, a disk rotatably carried in said recessed portion, said pivot pin being operably connected with said disk, and means adjusting said pivot pin from a position coaxial with said disk to an eccentric position.

References Cited in the file of this patent UNITED STATES PATENTS 2,231,900 Geofirion Feb. 18, 1.941 2,353,131 Ford July 11, 1944 2,384,899 Dixon Sept. 18, 1945 2,448,309 Grieco Aug. 31, 1948 2,596,916 Raney May 13, 1952 

